20744842 has 4 divisors (see below), whose sum is σ = 31117266. Its totient is φ = 10372420.

The previous prime is 20744809. The next prime is 20744863. The reversal of 20744842 is 24844702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17214201 + 3530641 = 4149^2 + 1879^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5186209 + ... + 5186212.

Almost surely, 2^20744842 is an apocalyptic number.

20744842 is a deficient number, since it is larger than the sum of its proper divisors (10372424).

20744842 is a wasteful number, since it uses less digits than its factorization.

20744842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10372423.

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 20744842 is about 4554.6505903307. The cubic root of 20744842 is about 274.7704619051.

The spelling of 20744842 in words is "twenty million, seven hundred forty-four thousand, eight hundred forty-two".